Improvement in rock-drilling machines



H COA-TE & L. JOHN.

Improvement in Rock Drilling Machines.

N0 12I,590.- Paten-tedbec.5,1871.

Fig. 2.

Witnesses. Inventor.

i AM Murmur/100mm: 2m 1w asses/1:3- 221M553.

UNITED STATES PATENT QFFICE.

THOMAS H. OOATE AND LEWIS A. JOHN, OF PLEASANT HILL, OHIO.

IMPROVEMENT IN ROCK-DRILLING MACHINES.

Specification forming part of Letters Patent No. 121,590, dated December5, 1871.

To all whom it may concern:

Be it known that we, THOMAS H. GOATE and LEWIS A. JOHN, of PleasantHill, in the county of Miami and State of Ohio, have invented a new andvaluable Improvement in Rock-Drills; and we do hereby declare that thefollowing is afull, clear, and exact description of the construction andoperation of the same. reference being had to the annexed drawing makinga part of this specification, and to the letters and figures ofreference marked thereon.

Figure 1 of the drawing is a representation of a vertical longitudinalsection of our invention. Fig. 2 is a rear elevation.

This invention has relation to drilling machines; and consists chieflyin the construction and novel arrangement of the tripping-mechanism,which operates to release and let fall the drill at regular intervals.

Referring to the accompanying drawing, A shows an upright frame,supporting a horizontal pulley-beam, B, slotted lengthwise and furnishedwith pulley-wheels b I), over which passes the rope I) from the windlassto the drill. U designates the drill; D, the Windlass around which therope I) winds. D is a toothed wheel on the Windlass-shaft, engaging witha pinion, D on a crank-shaft, D", on which is a ratchet-wheel, D

and crank-handle D The crank-shaft D pinion D and toothed wheel D areused in connection with the Windlass D for the. purpose of winding upthe rope I) in order to raise the drill. A pawl, 61, engages with thewheel D and prevents the shaft D from turning back and allowing thedrill to drop when the drill is not required to fall. E represents aWindlass in the lower part of the frame A; E, a large spur-wheel on itsshaft, e11- gaging with a pinion, E on a crank-shaft, E having acrank-handle, E and ratchet-wheel E. E represents a pawl, which engageswith said ratchet-wheel. The wheel E also engages with a pinion, F, on acrank-shaft, F, which has a crank-plate, f, at its inner and acrank-arm, f, at its outer end, and holds a fly-wheel at f. The

crankplate f is connected with a pitman, f which is coupled to asliding-head, G, which travels vertically on ways G secured to the innersides of'vertical posts G of the frame A, arranged as shown in thedrawing. Projecting from the face of the sliding-block 1 above the blockor head G is a bracket, g, holding a pulleywheel, 9, under and aroundwhich passes the rope b from the windlass D to the drill. To thisbracket is pivoted a pair of dogs, H, having shouldered ends h, whichare pressed under the block G by the force of a spring. I. These endsare also beveled, and are released from under the block G as the latterdescends by coming in contact with a stud or studs, J, proiecting fromone or both of the plates G By turning the crankarm f the block G isbrought down, raisingthe drill. As soon as the dogs come in contact withthe stud J they are released and raised by the weight of the drill,which then falls. The rope is unwound from the Windlass according as thedepth of the drill increases. The Windlass E may be employed to hold therope when it is desired to have it unwound automatically, or the toothedwheel E may be used as a communicating medium between the shafts E F, sothat power may be divided between them in operating the drill.

We claim as our invention 1. In a drilling-machine, the dogs H andspring I, in combination with the sliding-blocks G g, pulley g rope I1,pitman or crank-arm f, and studs J, substantially as described.

2. In a drilling-machine, the combination and arrangement of the pulleysI) b, rope b, Windlass D, pulley g, sliding-blocks G g dogs H, and studsJ, as and for the purpose specified.

In testimony that we claim the above we have hereunto subscribed ournames in the presence of two witnesses.

THOMAS H. UOATE.

Witnesses: LEWVIS A. JOHN.

ROBERT Ronnnrson, DAVIS Forms. (124)

